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건축공사시방서에서의 KS규격의 국제인증방안에 관한 연구
김경식,이재섭,김용수,이규진,조용훈,최완철,전재열,이현수,구재동,이기환 대한건축학회 2004 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.24 No.1
The purpose of this research is make out construction specifications for International Construction. Using off-shore products incur cost increase and longer delivery term of construction. and inconvenient on International Construction. Expand the range of additional local products conforming to performance. Life Cycle Cost. maintainability. operability. user's acceptability, etc.. And this study is suggest the standard formats and the techniques for construction specification.
저항을 이용한 프로판-공기 혼합가스의 점화한계 개선에 관한 연구
이춘하,오종용,옥경재,지승욱,이광식,심광렬 한국화재소방학회 2004 한국화재소방학회논문지 Vol.18 No.1
본 논문은 IEC형 불꽃점화 시험장치를 이용하여 저압 유도회로의 최소 점화한계를 프로판-공기 5.25 Vol.%의 혼합 가스에 대하여 실험적으로 구하였으며, 또한 유도회로의 인덕턴스 L에 안전소자로서 저항을 병렬접속하였을 경우 프로판-공기 5.25 Vol.%의 혼합 가스에 대한 점화한계 개선효과를 관찰하였다. 그 결과, 최소 점화한계는 전류의 크기에 따라 좌우되었다 또한, 전원으로부터 공급되는 에너지는 인덕턴스에 우선 축적되고. 그 초과분의 에너지가 폭발성 가스의 점화원으로 작용하였다. 점화한계 개선효과는 인덕턴스가 300 mH일 때, 최고 330%의 개선효과가 나타났으며 인덕턴스가 클수록 점화한계 개선효과가 크게 나타났다. 또한 병렬로 접속한 저항의 크기가 적을수록 점화한계 개선 효과가 크다. 본 연구결과는 본질안전 방폭형 전기기기의 연구개발을 위한 기본자료로 활용할 수 있을 뿐만 아니라 이들 기기의 방폭성능에 대한 시험자료로도 활용이 가능할 것으로 사료된다. This paper describes the minimum ignition limits for propane-air 5.25 Vol.% mixture gases in low voltage inductive circiuts. The improved effects on the ignition limit are studied by parallel safety components(resistors) for propane-air 5.25 Vol.% mixture gas in low voltage inductive circuits. The experimental devices used in this test are the IEC type spark ignition test apparatus. The minimum ignition limits are controlled by the values of current in inductive circuit. Energy supplied from elect source is first accumulated at the inductance, it's extra energy is working as ignition source of the explosive gas. The improved effects on the ignition limit are respectively obtained as the maximum rising rate of 330% by composing parallel circuits between inductance and resistor as compared with disconnecting inductance with the safety components. The more values of inductance increase the higher improved effects of ignition limit rise. The less values of resistor the higher improved effects of ignition limit rise. It is considered that the result can be used for not only data for researches and development of intrinsically safe explosion-proof machines which are applied equipment and detectors used in dangerous areas but also for datum for its equipment tests.
박금수,김영식,이진응,임종천,이강현,임경수,황성오,최경훈 대한응급의학회 1995 대한응급의학회지 Vol.6 No.2
To estimate the quality of the emergency medical services system of Wonju City, we studied the diurnal variations of 179 non-traumatic cardiac arrest victims who received cardiopulmonary reuscitation at the emergency center of Wonju Christian Hospital. Diurnal variations of non-traumatic cardiac arrest patients were as follows ; The occurence of cardiac arrest at day-time was higher than night-time; 18 cases (11%) from midnight to AM 4, 25 cases (14%) from AM 4 to AM 8, 42 cases (24%) from AM 8 to AM 12, 46 cases (25%) from AM 12 to PM 4, 35 cases (19%) from PM 4 to PM 8, 13 cases (7%) from PM 8 to midnight. Witness cardiac arrest was increased more during the day than night ; 40% from midnight to AM 4, 48% from AM 4 to AM 8, 57% from AM 8 to AM 12.52% from AM 12 to PM 4, 60% from PM 4 to PM 8, 38% from PM 8 to midnight. The transportation time at night-time cardiac arrest was more longer than day-time cardiac arrest ; 30±12mins from midnight to AM 4, 26±9mins from AM 4 to AM 8, 27±12mins AM 8 to Am 12, 25±11mins from AM 12 to PM 4, 25±9mins from PM 4 to PM 8, 35±15mins from PM 8 to midnight. The rate of restoration of spontaneous circulation(ROSC) in day-time cardiac arrest was higher than the night-time cardiac arrest ; 30% from midnight to AM 4, 36% from AM 4 to AM 8, 32% AM 8 to AM 12, 44% from AM 12 to PM 4, 41% from PM 4 to PM 8, 15% from PM 8 to midnight. The survival rate of cardiac arrest has been correlated with collapse time, early bystander CPR, early advanced care. To improve outcome for prehospital cardiac arrest, we concluded that early bystander CPR, and early advanced life support should be performed at the scene and during the transportation especially at night.
Kyoung-Sik Chun,Samuel Kinde Kassegne,박원태 국제구조공학회 2008 Structural Engineering and Mechanics, An Int'l Jou Vol.29 No.6
In this paper, we present a quadratic element model based on non-conforming displacement modes and modified shape functions. This new and refined 8-node hybrid stress plane element consists of two additional non-conforming modes that are added to the translational degree of freedom to improve the behavior of a membrane component. Further, the modification of the shape functions through quadratic polynomials in x-y coordinates enables retaining reasonable accuracy even when the element becomes considerably distorted. To establish its accuracy and efficiency, the element is compared with existing elements and - over a wide range of mesh distortions – it is demonstrated to be exceptionally accurate in predicting displacements and stresses.
Chun, Kyoung-Sik,Kassegne, Samuel Kinde,Park, Won-Tae Techno-Press 2008 Structural Engineering and Mechanics, An Int'l Jou Vol.29 No.6
In this paper, we present a quadratic element model based on non-conforming displacement modes and modified shape functions. This new and refined 8-node hybrid stress plane element consists of two additional non-conforming modes that are added to the translational degree of freedom to improve the behavior of a membrane component. Further, the modification of the shape functions through quadratic polynomials in x-y coordinates enables retaining reasonable accuracy even when the element becomes considerably distorted. To establish its accuracy and efficiency, the element is compared with existing elements and - over a wide range of mesh distortions - it is demonstrated to be exceptionally accurate in predicting displacements and stresses.